Control method for an electromagnetic actuator for the control of a valve of an engine from an abutment condition
a technology of electromagnetic actuator and abutment condition, which is applied in the direction of non-mechanical valves, magnets, magnetic bodies, etc., can solve the problems of high noise generated by electromagnetic actuator, substantial mechanical stresses on electromagnetic actuator, and the inability of position sensors to provide the precision and service life needed for profitable use for this purpose, etc., to achieve the effect of easy and economic incorporation
Inactive Publication Date: 2005-07-19
FAB ITAL MAGNETI MARELLI SPA
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Benefits of technology
[0007]The object of the present invention is to provide a control method for an electromagnetic actuator for the control of a valve of an engine, which is free from the above-mentioned drawbacks and, in particular, is easy and economic to embody.
Problems solved by technology
It has been observed, however, that in the known electromagnetic actuators of the type described above, the position of abutment against the second electromagnet is normally reached with a relatively high speed of impact of the actuator body against the second electromagnet, which causes both substantial mechanical stresses on the electromagnetic actuator and a high level of noise generated by the electromagnetic actuator.
In order to attempt to remedy the above-described drawbacks, it has been proposed to use an external position sensor, which provides, instant by instant, the exact position of the actuator body and makes it possible precisely to control the actual position of the actuator body; position sensors able to provide the precision and service life needed for profitable use for this purpose are not, however, commercially available.
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[0013]In FIG. 1, an electromagnetic actuator (of the type disclosed in European Patent Application EP1087110) is shown overall by 1 and is coupled to an intake or exhaust valve 2 of an internal combustion engine of known type in order to displace the valve 2 along a longitudinal axis 3 of the valve between a closed position (known and not shown) and a position of maximum opening (known and not shown).
[0014]The electromagnetic actuator 1 comprises an oscillating arm 4 made at least partly from ferromagnetic material, which has a first end hinged on a support 5 so as to be able to oscillate about an axis of rotation 6 transverse to the longitudinal axis 3 of the valve 2, and a second end connected by a hinge 7 to an upper end of the valve 2. The electromagnetic actuator 1 further comprises two electromagnets 8 borne in a fixed position by the support 5 so that they are disposed on opposite sides of the oscillating arm 4, and a spring 9 coupled to the valve 2 and adapted to maintain th...
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Abstract
A control method for an electromagnetic actuator for the control of a valve of an engine from an abutment condition, in which an actuator body actuating the valve and disposed to move between two electromagnets is maintained in abutment against a first excited electromagnet and against the action of at least one elastic body; in order to bring the actuator body into abutment against a second electromagnet, the first electromagnet is de-excited and the second electromagnet is then excited by means of excitation parameters, which are determined as a function of the measurement of the mean value of the disturbance force acting on the valve during the stage of de-excitation of the first electromagnet.
Description
[0001]The present invention relates to a control method for an electromagnetic actuator for the control of a valve of an engine.BACKGROUND OF THE INVENTION[0002]As is known, internal combustion engines of the type disclosed in Italian Patent Application BO99A000443 filed on 4 Aug. 1999, are currently being tested, in which the intake and exhaust valves are moved by electromagnetic actuators. These electromagnetic actuators have undoubted advantages, as they make it possible to control each valve according to a law optimised for any operating condition of the engine, while conventional mechanical actuators (typically camshafts) make it necessary to define a lift profile for the valves which represents an acceptable compromise for all the possible operating conditions of the engine.[0003]An electromagnetic actuator for a valve of an internal combustion engine of the type described above normally comprises an actuator body, which is connected to the stem of the valve and, in rest condi...
Claims
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IPC IPC(8): H01F7/18H01F7/08
CPCH01F7/1844F01L2009/2109
Inventor PADRONI, GIANNI
Owner FAB ITAL MAGNETI MARELLI SPA